Telephone system



. H. P. CLUSEN1 TELEPHONE SYSTEM.

APPLICATION HLED JULYIz, 1917.

Patented Oct. HS, WZL

HIIEMTRY f. CLA'USEN, OJF MO''N'J' VIIEIR'NON, NEW YO'K, ASSIGNOR T0 'WESTERN ELEC- 'ERIC COMPANY, INCORPORATED, OF'NEW YORK, N. Y.. A CORPORATION OF NEW TE'IEIPHNE SYSTEM.

To (IZZ wkom it may con-cera: i

Be it known that I, HENRY P. CLAUsnN, a citizen of the United States, residing at Mount Vernon, in the county of Westchester and State of New York, have invented certain new and useful lmprovements in Telephone Systems, of whichthe following is a full, clear, concise, and exact description.

This invention relates to telephone systems and particularly to trunking arrangements between exchanges. More particularly it relates to telephone systems wherein a so-called manual exchange Supplies service to a private branch exchange equipped with machine-switching tele hone apparatus, some subscribers of whic v are entitled to one class of service and others of which are entitled to another class of service The object| of the invention is to provideV an indicating device in a manual exchange which will notify the answering operator that a calling station from an automatic private branch exchange is or is not entitled to a specific class of service.

A feature of the invention is the use of the well-known line and supervisory lamps for indicating certain facts to an operator, in addition to those'which they ordinarily indicate. According to -this feature, the private branch exchange line, which is entitled to a certain class of service, such, for` instance, as unlimited or unrestricted service, When initiating a call through the use 'of automatic switches and a common two-way trunk to a manual central office, causes the line lamp to act fin the usual and wellknown manner, and causes the supervisory lamp of any cord, which the answering operator may choose, to also act in the usual and well-known manner. If, however, the private branch exchange line is entitled only to another class of servlce, such, for instance,

as service restricted to local connections, toll connections being denied, then means common to the trunk line and controlled by the automatic switch used in extending the connection, causes the line lamp to flash and the tttl supervisory lamp of any cord, which the answering operator may choose, to burn steadily.

Thus, the answering operator has forced on her attention the fact that the callino' line may or may not be given unrestricted service. Additional apparatus is provided by means of which the operator may restore specification of Letters Patent.

Pettemiflefll UMD., llll., 192i., ten. serial no. mam.

tral ofice and such a private branch exchange, are diagrammatically represented.

S1 and S2 represent substations at the private branch exchange, the ,first of which is entitled to unrestricted service, and the secondpf which is entitled only to restricted service. The part to theleft of the broken .line including the two suhstations mentioned,

represents the arrangetnent at` the private branch exchange, and the partto the right of the broken line represents the arrangement at a so-called manual office. i

At the manual oiiice, a cord-circuit of the ordinary and well-known type, here desi nated 1, is provided. A trunk line T, en mgv in jacks, J1 and JF at the central oiiice, and in a iack Js andfautomatic connector switches C81 and- CS2 at the private branch exchange, is provided vto lsupply incoming and outgoing service to the private branch exchange. A linel lam LLl, a line relay LR1, and a cutoff relay O1 of ordinary and Well-known construction are emplo ed at the central oflice end of this trunk. 'A LU, a line relay LR2, C02 are provided at-the change end of the trunk.

and a cutof relay private branch ex- Calls originating in the central ofiice are answered by an operatorat the private branch exchange by means of acord circuit C2 ending inv an answering plug P8 and a calling plug or J.

Calls o'riginating at the private branch ine lamp P4, bymeans of which theproper statlon is called through a jack dt' roc exchange are extended through line finder switches LF1 and LW, automatic connector switches US1 and CS2 and thenceover a comw mon trunk T to the exchange. At this' point,

the operatorls answering cord ending in plug P1 is equipped, in 'the well-known manner,

with a supervisory lamp SD, and a supervisory rela SRl for controlling this lamp;

With thls description of thel elements of by the establishment' of a circuit from ground, the uper left-hand winding of a repeating coil C1, the tip of the plug P1, the

. tip of the multiple` 'ack J 2, thence over the o ,lower conductor of-t e trunk T, through the armature and contact of the cutoff relay C02, the winding` of the relay LR2, thence 'back over the upper limb of the trunk T, to

the ring of the multiple jack J, the ring of the plug P1, through the winding of the supervisory' relay SR1', the lower left-hand lwinding 'of the repeating coil RC1, battery and ground. Through this circuit line relay LR2 is energized, which results in the establishment of a -circuit from ground, inner armature and contact of relay LR2, line lamp LL2, battery, and ground. Due to the' resistance of relay LR2, the relay SR1 is not energized in this circuit and so the superi visory lamp SL1 at this stage of the operation isilluminated through a circuit including battery, lamp SL1, sleeve of plug P1, sleeve ofjak Jz, winding of cut-off relay C01 to ground, and vsuch supervisory lamp SL1 will remaiii in this condition until' the call is answered at the private branch` exchange as will hereinafter be more fully explained. At the same time, a guarding potential is placed on the third or test conductors of the connector switches CS1 and C82, through the resistance R2, and 'the alternate contact and outer armature of relay LR2. The operator at the private branch exchange inserts the plug P3 into the'jack J 3, whereupon the line lamp LL2 is extinguished through the actuation of the cutoff relay CO2 in the well-known manner, and the supervisory lamp S'L1` and the supervisory lamp SL3 are extinguished', through the actuation of the two Supervisor* relays SR1 and SRS, which are energized; S 1 over a path extending from ground,the upper-right-hand winding of the repeating coil RCs, the tip of the plug P3, the tip of the jack J3, the ring of the jacklJz, the ring of the lug P1, the winding of supervisory relay S 1, the lower left-hand winding of repeating coil RC1 to battery and ground; and SR3 through a circuit' from ground, the upper left-hand winding of repeating coil R01, the tip of the plug P1, the tip of the jack Jz, the ring of the jack J 3, the ring of the plug P3, the winding of supervisory relay SRS, the lower righthand winding of repeating coil RC3, to battery and ground. i

The further extension of this call is effected in any well-known manner, through the 66 use of the calling plug P* and the jacks J and J 5, leading to the stationsof the private branch exchange.

` A call initiated by the substation S1 may be extended by means of a line finder LF1, actuated in a manner well-known to one skilled in the art. 'By means of the manipuand outer varmature of the cut-off relay C01, the winding of the polarized relay PR, the winding of the line relay LR1, the inner armature and contact of the cut-off relay C01, the upper limb of the trunk T, the terminal t2,,the brush 62, the impedance coil 12, within the circuit of the connector switch CS1, battery and ground. The flow of current through this circuit energizes the line relay LR1,but does not energize the polarized relay PR1, due to its present dircction of flow. A circuit is thereupon established from ground, the normal contact and armature of the polarized relay PR1, the varmature and contact of the relay LR1, the line lamp LL1, to battery, and ground, which causes the lamp LL1 to burn steadily.

The operator at the central oflice observing the steady burnin of the line lamp LL1, inserts the plug P1 1nto the answering jack J 1, whereupon the line lamp LL1 is extinguished through the opening of the circuit just described by the cut-off relay in the wellknown 'manner/, and a circuit established through which the supervisory relay SR1 is energized and the supervisory lamp SL1 is extinguished. The circuit extending from ground, the impedance coil I1, brush b1, terminal t1, the lower conductor of the trunk T, ring of. plug P1, winding of supervisory relay SR1, lower left-hand winding of repeating coil RC1, to batter and ground, energizes the rela SR1, an places a shunt around the lamp L1 extending from battery,

the Contact and armature of relay SR1, the

resistance R, to the lamp S'L1, the other terminal of which is also connected to 'battery and ground.

' Should the substation S2 initiate a call, the trunk will be seized, not by connector switch US1 but by a connector switch US2 throu h the agency of line finder switch LF. e

trunks extended to, the connector switch US1' are now reversed, so that the current su plied through the impedance coils I8 and 4 to the central oflice is reversed in direction to that supplied through the im edance coils I1 and Iz. In this case the po arized relay PR, as well as the line relay LR1 will be nerglzed and a circuit established for the naeaaaa line `lamp LIAI from ground, the interrupter I, the alternate contact and armatui'e of rela P'R, the armature and contact. of relay I' 1, the line lamp LIJ, to battery and round, through which circuit the line lamp L1 is caused to flash,it being supplied with current when the interrupter' I is on a conducting segment, and deprived of current whilethe interrnpter I is'on ,an insulated segment. The operator at thecentral ofiice i observing the flashin%of the line lamp LL1 will insert her plug into the answering .jack J1, whereupon the ener 'zation of the the operator has a further indication that the i calling station is not entitled to unrestricted servlce. If such calling subscriber asks to be connected with some station through toll service, it will be the duty of the operator to deny him, butif only a local-call is asked for, then the'operator may extend the cent nection in the well-known manner.

A jack J, which may. bev what is known as the multiple jack,zhas its terminals reversed so that upon such a -call as that just 'de- 'scribed, from the substation S2 the o erator may lace the plug P'rl in the fjack 2, and-- there y lace the supervisory relay SR1 undeircr mary conditions, whereupon it will be enerfiilzed'and shunt out 'the supervisory lam S;

hatis claimed is:' .4 y w ,A

l. .In a telephonesystem, an exchange, a branch exchange, a two-wiretrunk extending between said exchange 'and'said branch exchange, a visual lcall-indicating device in-l dividual to .said trunk-at the exchange end thereof responsive to .the iiiitiation of a call at the'branch .exchange end .thereof, cord circuits including supervisory relays at said exchange, and means at' the branch' exchange for difi'erently actuating said device and said `Supervisor-y relays.

2. In a' telephone system, an exchange, a branch exchange, a two-Wire trunk extending between saldexchange and said branch. exchange, a visual call-indicating device individual to said'trunk at the exchange end thereof, cord circuits including Supervisor relays at said exchange, means at the brane .exchan e for. difierently actuating said callindicatmg deviceand said -supervisory relays, and means underthe control of an operator at said exchange for differently actuati'ng 3. In'a telephone system, an exchange, a branch exchange, 'a two-Wire trunk between said exchanges, multiple connections to said said cord circuits relatively to said i trunk.

trunk at .said branch exchan e end thereof, ,f-

said multiple connections being difl'erentlygffl arranged, a visual call-indicating device individual vto said trunk at the exchange end thereof saidv multiple connections for actuating saidv device in a particular manner' and means responsive to a connection established over said trunk through a diiferently connected one -of said multiple connections for actuatingsaid devicein a difl'erent manner. f

l. In a telephone system, an exchange, a

"branch exchange, a two-Wire trunk between said exchanges, multiple connections to said trunk atsaid branch exchan e end thereof, said multiple connections belng difl'erently arranged, alvisual call-indicating device individual to said trunk at the exchange end thereof, cord circuitsi-ncluding' supervisory relays at said exchange, means for diflerently actuating said device and-said su ervisory'r'elays in accordance with the multiple connection through which a connectionmay be established.

In witness -whereof,vI liereunto Subscribe means responsive to a connection established over said trunk through one of my name this'lOth-day of July, A. D. 1917.v

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